From: C Michael Sundius <Michael.sundius@sciatl.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>,
linux-mm@kvack.org, linux-mips@linux-mips.org,
jfraser@broadcom.com, Andy Whitcroft <apw@shadowen.org>
Subject: Re: sparsemem support for mips with highmem
Date: Fri, 15 Aug 2008 10:16:33 -0700 [thread overview]
Message-ID: <48A5B9F1.3080201@sciatl.com> (raw)
In-Reply-To: <20080815163302.GA9846@alpha.franken.de>
Thomas Bogendoerfer wrote:
> On Fri, Aug 15, 2008 at 09:12:14AM -0700, C Michael Sundius wrote:
>
>> yes, actually the top two bits are used in MIPS as segment bits.
>>
>
> you are confusing virtual addresses with physcial addresses. There
> are even 32bit CPU, which could address more than 4GB physical
> addresses via TLB entries.
>
> Thomas.
>
>
Ah, your right. thanks. "but it's not necessar*il*y a good idea". That
is to say, we don't put
memory above 2 GiB. No need to make the mem_section[] array bigger than
need be.
This gives further credence for it to be a configurable in Kconfig as well.
Mike
WARNING: multiple messages have this Message-ID (diff)
From: C Michael Sundius <Michael.sundius@sciatl.com>
To: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Dave Hansen <dave@linux.vnet.ibm.com>,
linux-mm@kvack.org, linux-mips@linux-mips.org,
jfraser@broadcom.com, Andy Whitcroft <apw@shadowen.org>
Subject: Re: sparsemem support for mips with highmem
Date: Fri, 15 Aug 2008 10:16:33 -0700 [thread overview]
Message-ID: <48A5B9F1.3080201@sciatl.com> (raw)
In-Reply-To: <20080815163302.GA9846@alpha.franken.de>
Thomas Bogendoerfer wrote:
> On Fri, Aug 15, 2008 at 09:12:14AM -0700, C Michael Sundius wrote:
>
>> yes, actually the top two bits are used in MIPS as segment bits.
>>
>
> you are confusing virtual addresses with physcial addresses. There
> are even 32bit CPU, which could address more than 4GB physical
> addresses via TLB entries.
>
> Thomas.
>
>
Ah, your right. thanks. "but it's not necessar*il*y a good idea". That
is to say, we don't put
memory above 2 GiB. No need to make the mem_section[] array bigger than
need be.
This gives further credence for it to be a configurable in Kconfig as well.
Mike
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next prev parent reply other threads:[~2008-08-15 17:16 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-14 22:05 sparsemem support for mips with highmem C Michael Sundius
2008-08-14 22:35 ` Dave Hansen
2008-08-14 22:35 ` Dave Hansen
2008-08-14 23:16 ` C Michael Sundius
2008-08-14 23:16 ` C Michael Sundius
2008-08-14 23:52 ` C Michael Sundius
2008-08-15 0:02 ` Dave Hansen
2008-08-15 0:02 ` Dave Hansen
2008-08-15 8:03 ` Thomas Bogendoerfer
2008-08-15 8:03 ` Thomas Bogendoerfer
2008-08-15 15:48 ` Dave Hansen
2008-08-15 15:48 ` Dave Hansen
2008-08-15 16:12 ` C Michael Sundius
2008-08-15 16:12 ` C Michael Sundius
2008-08-15 16:20 ` Dave Hansen
2008-08-15 16:20 ` Dave Hansen
2008-08-15 16:33 ` Thomas Bogendoerfer
2008-08-15 16:33 ` Thomas Bogendoerfer
2008-08-15 17:16 ` C Michael Sundius [this message]
2008-08-15 17:16 ` C Michael Sundius
2008-08-15 17:37 ` Dave Hansen
2008-08-15 17:37 ` Dave Hansen
2008-08-15 18:17 ` C Michael Sundius
2008-08-15 18:17 ` C Michael Sundius
2008-08-15 18:23 ` Dave Hansen
2008-08-15 18:23 ` Dave Hansen
2008-08-16 20:07 ` Thomas Bogendoerfer
2008-08-16 20:07 ` Thomas Bogendoerfer
2008-08-18 16:44 ` Randy Dunlap
2008-08-18 16:44 ` Randy Dunlap
2008-08-18 21:24 ` Christoph Lameter
2008-08-18 21:24 ` Christoph Lameter
2008-08-18 21:27 ` Dave Hansen
2008-08-18 21:27 ` Dave Hansen
2008-08-18 21:33 ` Christoph Lameter
2008-08-18 21:33 ` Christoph Lameter
2009-01-16 21:46 ` Michael Sundius
2009-01-16 21:46 ` Michael Sundius
2009-01-21 14:39 ` Christoph Lameter
2009-01-21 14:39 ` Christoph Lameter
2008-08-18 21:57 ` David VomLehn
2008-08-18 21:57 ` David VomLehn
2008-08-19 13:06 ` Christoph Lameter
2008-08-19 13:06 ` Christoph Lameter
2008-08-19 23:38 ` David VomLehn
2008-08-19 23:38 ` David VomLehn
2008-08-19 23:53 ` Jon Fraser
2008-08-19 23:53 ` Jon Fraser
2008-08-20 13:58 ` Christoph Lameter
2008-08-20 13:58 ` Christoph Lameter
2008-08-20 19:28 ` David VomLehn
2008-08-20 19:28 ` David VomLehn
2008-08-20 20:51 ` Christoph Lameter
2008-08-20 20:51 ` Christoph Lameter
2008-08-15 16:30 ` Thomas Bogendoerfer
2008-08-15 16:30 ` Thomas Bogendoerfer
2008-08-26 9:09 ` Andy Whitcroft
2008-08-26 9:09 ` Andy Whitcroft
2008-10-06 20:15 ` Have ever checked in your mips sparsemem code into mips-linux tree? C Michael Sundius
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